Telephone noise-excluder and current-saving device.



W. E. BURT.

TELEPHONE NOISE EXGLUDER AND GURRENTRSAVING DEVICE.

APPLIUATIOH FILED MAY 11, 1910.

967,719. Patented Aa .1e,,191o. f

' comic.

.To all whom it may concern:

s'rrns WILLIAM EBENEZEB- BURT, OF YUBA, WISCONSIN.

TELEPHONE NOISE-EXCLUDER AND CURRENT-SAVING- DEVICE.

Specification of Letters Batent.

Patented Aug. 16, 1910.

Application filed may 11, 1910. Serial No. 560,603.

Be it known that 1, WILLIAM E. Bunn'a citizen of the United States and a resident of Yuba, in the county of Richland and State of Wisconsin, have invented a new and Improved Telephone Noise-Excluder andCurrent Saving Device, of which the following is a full, clear, and exact description. I

The invention is an attachment for'telephones, to exclude the local noise and save the battery current.

Many ofthe leading makes of telephones are constructed so that when the receiver is hanging in the automatic receiver hook, the talking circuit is broken and the ringing circuit closed. lhe primary circuit of the induction coil, the battery circuit and the transmitter are in circuit, and this circuit is opened or closed through the automatic switch afforded by the receiver hook. When the hook is down, the ringing circuit is closed. The secondary circuit of the inducwindin of the induction coil are connected. In a telephone of'this character it 1s clear that if the receiver hook is gradually pulled down there will be a point reached in which the battery circuit is broken and one. can

hear but cannot be heard over the line, If

the receiver hook is fully opened and the,

transmitter in action, the transmitter picks up any local-noise, the noise being heard by the operator in the receiver. v j

My invention is an attachment for the telephone, which is designed to hold the receiver hook at a point at which the battery circuit is broken andthe talking circuit completed.

Reference is to be had to the accompanying drawings forming a part of this specifi-- cation, in which sinnlar charactersof reference indicate the views. Figure 1 1s a perspective view of a nois excluder' and current saving device embody- 111g my invention, the attachment bein shown applied to the telephone and engaged wlth the receiver hook to retain the latter in a position in which the battery circuit is broken and the talking circuit closed; Fig. 2 1s a sectionon the line 2-2 of Fig. 1, look- 111g in the direction of the arrow; Fig. 3 is a section similar to Fig. '2, with the locking lor holdlng hook of the attachment released corresponding-parts in all from the receiver hook; and Fig. 4 is a veri tical section on the lined-4= of Fig. 1-.

In a practical embodiment of my invei tion I provide a fastening plate 5 and a lockin or holding hook 6, the fastening plate lieing provided with a vertical slot 7 for the passage of the receiver hook 8, and also providedfwith a narrower vertical slot 9, shown to be arranged atone side of the slot 7. The ends-ofthe fastening plates are constructed with the customary screw openingsfor receiving the fastening screws 10; and fromthe slot 7 one end of the plate is vertically split so that the divided portions of the plate can be sprung apart and passed over the receiver hook to place the latter in the slot 7. i The hook 6 is preferably of G-form, and is fulcrumed at its lower end to the fastening-plate, as indicated at 11,

and'provided at its outer vertical edge with a stiffening flange 12,'-and is also provided with a similar flange 13 at the inner edge of -its upper laterally-extending arm. The flange 12 is extended at a point 1ntermediate its length to form a thumb-piece 12, by which the hook is returned to a retainingp'osition. At the junction of the vertical and laterally-extending arms of the hook,

the same is flattened at the inner side, as-

indicated at 14, to seat, when in its locking position, on the upper edge of the receiver hook 8, as shown In Figs. 1 and 2. By the construction of the retaining hook or memher 6 in the manner shown and described,

when in its looking or holding position. it

willbe frictionally held in place by the.

action of the receiver hook tending to-moveupwardly. When, however,the receiverhook is slightly depressed,the retaining hook will swing backnnder the action of gravity.

To limit-the outward movement ofthe re taining hook and hold the upper portion of the hook close to the fastening plate 5, the

point of the laterally-extending arm of the hook is providedv with a stop projection 15, and. the fastening plate 5 is provided with a combined stop pro ection and retaining clip 16, engaging over the upper edge of the laterally-extending arm of the hook, this edge of the hook, as shown, being COIICBII. trically curved to the fulcrum 11.

In applying the attachment to the telephone, after the receiver arm has been passed into the slot 7, the fastening plate is temporarily secured through the slot 9, by a screw or similar device. This temporary fastening on the plate allows the latter to be vertically adjusted until a point is found, which, when the hook is in retaining position, will hold the receiver hook so that the battery circuit .will be cut off While the talking circuit remains completed. The plate is then secured by the permanent fastenings 10. Having thus described my lnventlon, I

claim as new and desire to secure by Let-- ters Patent.

1. In combination, a telephone hook for controlling the. battery and talking circuits, a fastening member, and a retaining member carried by the fastening member and arranged to engage the hook and retain it at a point where the battery circuit is broken and the talking circuit completed.

' '2... In combination, a telephone receiver hook for controlling the battery and talking circuits, and a retaining member arranged to move into engagement with the hook and hold it at a point where the battery circuit is broken and the talking circuit completed.

3. In combination, a telephone receiver hook, and a retaining hook arranged to engage the reeeiver hook and hold it at an intermediate point of its range of travel, and pivotally supported to swing from engagement with the receiver hook when released by the latter.

i. A telephone attachment comprising a fastening plate having a receiver hook slot, and a retaining hookfor the receiver hook, fulc'rumedto the plate to swing across the said slot.

- 5. A telephone attachment comprising a fastening member, and an approximately C- shaped retaining hook for engaging the receiver hook of the telephone, fulcrumed at its lower end to the fastening member.

6. A telephone attachment comprising a fastening plate, and a gravity-returned retaining hook for engaging the receiver hook of the telephone, fulcrumed to the fastening plate.

7. A telephone attachment comprising a fastening plate, an approximately C-shaped retaining hook for engaging the receiver hook of the telephone and holding the latter'in a-depressed position, and stops respectively carried by the hook and by the fastening plate, arranged to limit the outward movement of the hook, with the stop of the fastening plate engaging over the outer face of the hook.

In testimony whereof I, have" signed my name to this specification in the presence oftwo subscribing witnesses.

WILLIAM EBENEZER BURT. Witnesses:

G. M. THOMPSON, THOS. P. BURT. 

